druid连接池出现GetConnectionTimeoutException异常

[dlnuyuxiaowei]

1、bug描述
mycat在使用了一段时间（大概一个月）后，druid会出现创建新连接超时的异常
nested exception is org.apache.ibatis.exceptions.PersistenceException: ### Error querying database. Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is com.alibaba.druid.pool.GetConnectionTimeoutException: wait millis 60000, active 0, maxActive 100, creating 1, createElapseMillis 6995022

2、版本号(非常重要)
mycat：1.6.7.6-8.1
druid: 1.1.24